Below is a structural comparison of construction standards.
|Structural Design Requirements:||Site Built & (§)Modular/NY Code:||Double Wide/HUD Code:|
|Live Load Minimum, Wind Load||Horizontal, 10psf||More (Horizontal, 15psf)|
|Live Load Minimum, Roof Load||Snow/live, per zone map NYCRR||Per zone map, HUD|
|Floor Distribution Load||Live, 40psf (§ Floor system may be wood w/removable steel frame carrier or wood w/non-removable steel framt that is permanent part of home)||Same, (Floor system wood witn non-removable steel frame that is permanent part of home)|
|Load Deflections (Max.), Floors||Unplastered, 1/240 span||Same|
|Load Deflections (Max.), Roof||Unplastered, 1/180 span.
Wall stud & roof rafter spacing 24"
More wall stud & roof rafter spacing 16"
|Windstorm Protection: Siding & Overturn||Standard Methods||More, designed provisions for support & anchoring|
|Windstorm Protection: Resistance to Weather||Exterior cover materials & construction duly tested for resistance to elements & use.||Same|
|Structural Tests||Assemblies not subject to engineering design, are tested per appropriate Code.||Same|
|Fire Safety: Interior Finish||Flame spread rating not exceeding 200||Same|
|Fire Safety: Furnace, Water Heater & Cooking Range Areas||Combustible surfaces not to exceed surface temperature of 175°||More (special protection with gypsum/asbestos/sheet metal)|
|Fire Safety: Smoke Detection||One @ sleeping area, one inside each sleeping room.||Less one per sleeping area.|
|Heating System||§ May be factory installed or completed on site.||Factory Installed.|
|Exit Facilities (Minimum):
|Exit Facilities: Egress||One per habitable area.||Same.|
|Structural Design Requirements:||Site Built & Modular/NY Code:||Double Wide/HUD Code:|
|Appliances||With or without appliances.||Same.|
|Space Planning (Min. Req.): Overall Floor Area||Not specified.||Same|
|Space Planning (Min.Req.): Size of Rooms||At least one habitable area of 150 sq.ft. All others expect kitchen, 80 sq.ft.||At least one living area of 150 sq. ft. Bedroom minimum of 50 sq. ft. if single occupied, 70 sq. ft. for double.|
|Kitchen Cabinets||§ May be installed or completed on site.||Kitchen cabinets and carpets factory installed.|
|Ceiling Height||7½ ft., except if sloped roof, it can be 7 ft. if 50% of ceiling area is 7½ ft.||Less, 7 ft. minimum|
|Hallways||Not specified.||Minimum 28" wide.|
|Walls||May be finished or pre-prepared dry wall.||Same|
|Light & Ventilation (Min.): Glazed Area||8%||Same|
|Light & Ventilation (Min.): Unobstructed Area||4%||Same|
|Light & Ventilation (Min.): Mechanical Ventilation||Per ASNI 62-89 and 62a-1990||Habitable: 2 air changes/hour.
Bath: 5 air changes/hour.
|Thermal Protection||Equipment & insulation to provide 68° inside temperature during winter months.||More (equipment & insulation to maintain 70° inside temperature during winter months)|
|Windows||To meet envelop thermal heat loss requirements, usually thermopane.||Same.|
|Plumbing Material||Water supply: galvanized or copper pipe.
Drain/vent: all types.
|Water supply: galvanized, copper or PVC.
Drain/vent: all types.
|Construction & Safety||Accepted methods.||Same.|
|Testing & Inspections||Only local inspection required.||Testing & inspection required during production.|
|Electrical: Material||Acceptable under NEC.||Same.|
|Electrical: Construction & System||NEC Standards.||More testing & inspections are required during production.|
|Transportation & Sales||NYS Code does not regulate transportation or sales.||Designed to fully withstand shocks & vibrations during transportation. HUD regulates transportation & sales.|
|Design Evaluations||Site-built residence not necessarily designed or checked by professionals.||More (designed by professional Engineers/Architects and checked by independent professionals).|
|Inspections During Construction||Local inspections only.
§ Factory & local inspections.
§ Denotes modular homes only.